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I have just read your article on ceramic bearings and am forced to give you an unprofessional view point. Firstly i am an 80 year old bike rider who rides weekends with a younger group of 6o year old riders. If you are still with me , my riding consists of between 30 to 40 kilom each ride at a speed of between 25ks and 35ks . I find recitals about ceramics ...

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